INA149 Difference Amplifier

Industry's Highest Accuracy
Difference Amplifier for Applications
with CMV up to ±275V



The INA149 is a precision unity-gain difference amplifier with the industry's highest Common-Mode Rejection Ratio (CMRR) for high input common mode voltage (CMV) applications. With 100dB (typ) CMRR, the INA149 can accurately measure small differential voltages in the presence of common-mode signals up to ±275V. The INA149 inputs are protected from momentary common-mode or differential overvoltage up to 500V making it the ideal solution for high accuracy, high voltage industrial applications.

Features

Extended Input Common Mode Voltage:

  • ±275V at Vs = ±15V
  • Minimum CMRR of 90dB guaranteed over full temp.
    range from –40°C to 125°C

Wide Supply Range:

  • +4V to 36V or ±2V to ±18V

Excellent Gain Accuracy and Linearity

  • Fixed Differential Gain = 1V/V
  • Low Gain Error: 0.02% max
  • Non-Linearity: 0.001% max
  • 500kHz Bandwidth

CMRR vs. Frequency

Battery Stack Monitoring Application


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Applications

  • High-voltage current sensing
  • Battery cell voltage monitoring
  • Power-supply current monitoring
  • Motor control

Leading Instrumentation Amplifier Portfolio

Device Gain CMRR
(dB min)
G = 100
Offset
Drift
(μV/°C
max)
G = 100
Gain
Error Drift
(ppm/°C
max)
G = 1
Input Bias
Current
(nA max)
BW
(kHz)
at
G = 100
Supply
Current
(mA max)
Supply
Voltage
(V)
INA826 1 - 1000 120 2.1 1 65 60 0.25 2.7 to 36
INA333 1 - 1000 100 0.1 5 0.2 3.5 0.075 1.8 to 5.5
PGA280 0.125 - 128 122 0.17 2 1 20 3 ±5 to ±18
INA129 1 - 10000 120 0.7 10 5 200 0.75 ±2.25 to ±18
INA121 1 - 10000 96 5.2 10 50 50 0.525 ±2.25 to ±18
INA163 1 - 10000 70 1.2 (typ) 10 1200 3400 12 ±4.5 to ±18


The NEW INA826 is a new 2.7-36V supply instrumentation amplifier that offers a 40% reduction in power consumption, 50% lower settling time, 35% lower noise, 60% lower gain drift (G>1) and over 1.5 times better common mode rejection ratio than its closest competitor.
The INA333 is a low-power, precision instrumentation amplifier offering excellent accuracy. The versatile 3-op amp design, small size, and low power make it ideal for a wide range of portable applications.
The PGA280 is a high-precision +/-5V to +/-18V supply instrumentation amplifier with digitally controllable gain and signal integrity test capability. This device offers low offset voltage, near-zero offset and gain drift, excellent linearity, and nearly no 1/f noise with superior common-mode and supply rejection to support high-resolution precision measurement.



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Datasheet

Guide

  • Analog Signal Chain Guide Analog Signal Chain Guide
    (slyb174.pdf)
    Download

Tools

Medical News Coverage

Additional Resources

TI E2E Community
Visit the Amplifiers forum to ask questions and share knowledge with fellow engineers.






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